Front margin stop means for duplicating machines



March 9, 1943. M. P. NEAL FRONT MARGIN STOP MEANS FOR DUPLICATING'MACHINES origina; Filed April 7,( i959 2 sheets-sheet 1 E' INVENTOR rrzs PJVeaZ :le JZO 4a/daf W @by @s M. P. NEAL 2,313,163

FRONT MARGIN STOP MEANS FOR DUPLICATING MACHINES March 9, 1943.

2 sheets-sheet 2 Original Filed April 7, 1939 Patented Mar. 9, 1943 -FRONT'MARGIN STOP MEAN SFORJDUPLL- CATING MACHINES lvIorris ,P.- NeaLlQuincy, Ill. assignorftopittmlnc0ID0rated,"Chcago, Ill., ra corporation of West virginia `:origina-l ,fapplication April 7, 1939, dserial fno. 266,518. Divided and this application October `5.5552115141,*Serial No. 416,540

-9- Claims. 01. 10i- 132) invention relates lj/Ovfzdllplicating apparatus andparticularly ,ftoanyimproved form. of blaokprinteduplicating apparatusemploying a master sheet in thej-form-of a tlflinsheetfof-aluminum or the like upon-Which a suitablevink repellent may improved machine adjacent l.toVV one er'idoir the drum; f

be` spread for controlling l,the:eective-application.V of ink` to i the; sheet. My :tpresent improvements are, not-however toi-beg restrictedA to `use in connection Awith this typeof; machine-:so `faras tl1ey-are applicables,` to other types -yof5machines- Myginventionhas forgitsrobject' thev provision Y:ofan improved' forimof: stop.A mechanism: for .the

-copy sheetszadapted to; cooperate eiectively; with the sheet: feeding; :means-for; :insuring ithat the successive sheets shalhbepresented in accurately aligned position. :Forattaining this result,"I have .-providedaanf opening in thezpwall of. thedrumvat one side` portion with stop-mechanism vmovaloly `Inountedain;l said' openingrso .as normallyy toibe carried aroundzbythe drum; together withmeans vadapted. to engage the :stopzmechanism vupon each succeedingzzrevolution of 'the drum .forlholding the stopme'chanism stationaryfora short period -:upon each revolution of, the drum, `.suchi holding means being arranged so as to release. the stop imechanism. for. the sheets, in Atimed: 'relation-y With 1' respect .tot the rotation ;ofthe:drum fori permitting. the: sheets; to:` -go-:t forward; by .'the.;.action of thetdrumaand the cooperating.platen` or. mpresisioni rollerigin thegdesredtadjusted.gposition :fwith :respect to the master; sheet carried, by; vthe fdrum. In my improved construction, a margnfstop bar is mounted between two arms'whichare adaptedto swingaabout;theiaxis' of thedrum spring Ikmeans beingg-proyidedfior ,holding the Y mot-ionron the drum. Latelfij-imeanspadjacent to the drum-g engages the stopgbarjmechanismuat:a

Itis anotherobject of my invention to improve -me`chanisms ofv this ,tyle in sundry detailshereinafter pointed out. "The Preferred means by whichjl ,have ,accomplished` my.. 4se,vera1,objects are.,.ill ustrated in L.the accompanying drawings,

. infr-whichfs. Lis a verticalifsectionahview,throgghamy 55 Figs. 2 and 3--Lare viewssimilaixtoFig. 1. but showing changedpositions V.ofi the parts;-. and Fig.` i iswa.verticalasectional View en anenlarged scaleA through-a2 portionV of the. improved sheet stopping,means..carried by.. the drum, `with the partsin substantially' thesalne relative .position .as isshown-.in Fig. `l.

:Referring now vto thevfseveralvgures of -the drawings; in-which corresponding partsv are indicated by thesamereference characters, ,I0 :indicates a frameworkv supporting ;-a.heayy shaft i I havinga drum xed-ly mounted thereon,.su,oh

-drumoomprisiiilg sections I2 and; lg3, the section lthatof .thesection i3. Y.The drumsection |3`-is -providedzwithran-links pad fl4-wrappedV .therealoout for1 receivingva sllillyfvoi` ink; from-any suitable source. I'IThegdrum section I2 isyprovidedwith amaster sheet; l5formedpfg-aluminumtor other l suitable material andgseeuredjJ-igirmlyupon the :drum section `by any 1 approved; holding means.

As is clearly shown in Figjl, the' digging sections |2,and |3aare; spaced apart-;eircumferentially so -asto provide;afsubstantialopeninggat;-I6 `in the periplfieralywall of the drumras aat/.holei l'Below-i` the drur n,;an .impression f ro'ller- I'i.is

--rotatablyimonnted in posiifiorr` for :engagement -witlr the faceoi the *masten 'sheet I 5; as` the drum rotates in counterclockwise:direction:in the hgures. :In: the arrangement shown". the. impression roller is mounted .uponarms 1.8;. pivotallyimounted at; their; rear. ends: at: ltlgsonas:.torrenalolel the .impression rollerzto.movevertically with respect to theV drum. 'Thearms' l'8atxoppositegsides of the machine are connected .byf.; a..crossbar2 which engages plungers.v 2 lunormallyf. supported; by; coiled springs: 22 which bear .atrlither lower.l ends upon -a rigidly mounted crossbar23. 'Theiarrangement is such that the impression roller Il. isv normally pressed upwardly Joy;v the. springs.' 22v -into -position for engagementlwith. the face .offthemaster sheet |5.on thel-drumisection .of -greaterwdiameten .Suitable-means oiv-V any approvedtypefis provided `for limiting the upward movement-of the irnpressionf-r'ol-ler I'1 forvpreventing engagement of :the'roller with the-ink pad Si 4 carried-'bythe drumsection I3 of smaller size.

A-'short'di'stance toi-'the rear=of the impression ro11eri|1,=a tray. orl table-124 ofany suitable"v type `is provided for supporting afpiley of.copy sheets 25 inv engagement with Zar. suitable"'flangedf` plate l`293 which normally limits theforward movement `ofy the copyi'sheets. r-.A Iforwardingfroller'i21 is rotatably mounted in engagement with the top sheet of the pile of copy sheets, being; supported in position by means of a shaft A mutilated roller 29 is rotatably mounted in position a short distance in front of the forwarding roller 21, being supported by means of a shaft 30. The arrangement is such that the rollers 21 and 29 cooperate with each other for forwarding the copy sheets 25 one at a time into position above the impression roller I1 as is clearly shown in Fig. 2. Inasmuch as the means for operating the rollers 21 and 29 and their cooperating parts form in and of themselves no part of the present invention, it is believed to be unnecessary to show or to describe the arrangement by which the operation of the rollers is effected.

This case is being led as -a division of my application Serial No. 266,518, filed April 7, 1939, Patent No. 2,260,330, October 28, 1941, covering improvements in duplicating apparatus. details of therarrangement of the partsv so far described are disclosed in said prior application to which reference may be made.

My improved stop means for limiting the forward movement of the copy sheets by engagementwith the leading edges of the copy sheets as they are forwardedY by the rollers 21 and 29 vcomprises two arms 3| at opposite sides of the machine, such arms inthe arrangement shown 'being pivotally mounted on the hubs of the mounting arms 3Ia of the drum section l2. At their end portions, the arms 3| carry a crossbar 32 which in the arrangement shown is formed integrally with the adjacent portions of the arms 3|, as is best shown in Fig. 4. As is disclosed in Fig. l, the arms 3| are connected by means of coiled springs 33 with the end Walls `34 of the drum section I3, such springs serving to hold the bar 32 normally in engagement with a radially positioned face portion 35 of the drum section I3. For cushioning the arms 3| with respect to engagement with the drum section I3, a bumper member 36, preferably of rubber, is provided on each of the arms 3|.

Immediately below the drum, I have provided latch members 31 pivotally mounted by .means of rivets 38 on brackets 39 at opposite sides of the machine. Each of the latch members 31 is provided with a spring in connection therewith serving normally to holdthe member swung to the limit of its movement in counterclockwise direction in said Fig. 1, the motion of the latch device in counterclockwise'direction in said figure being limited by stop devices comprising bumpers 4I, preferably of rubber. As is clearly shown in Fig. l, the latch members 31 are provided at their upper ends with lugs 42 which normallyextend into the paths of movement of rollers 43 carried by the crossbar 32, the rear faces of Vthe lugs 42 being obliquely disposed, as is clearly shown in said Fig. 1.

`In the rotation of the drumin counterclockwise direction in Fig. 3 bypower applied through the driving shaft I I, the crossbar 32 Astands normally in engagement with the face portions 35 of the drum section I3, in whichposition the crossbar travels about with the drum; `When however the crossbar reaches theposition as shown in Fig. l, the rollers 43 are brought into engagement with the lugs 42 by which the forwardmovement of the crossbar 32is stopped so as to permit the `crossbar to remain stationary during the immediately following-*continued rotation of the drum; this being permitted by reason of the fact that the crossbark 32 is located The in the opening I5 in the face of the drum. When bumper plates 44 carried by the drum section I2 are brought into contact with the bumper members 36, so as to apply increased pressure for urging the crossbar 32 toward the right in Figs. 1 and 2, the rollers 43 by a camming action upon the obliquely disposed faces of the lugs 42 force` the latch members 31 to swing in clockwise direction in said figures against the action of the springs 40 for freeing the crossbar 32 from such latch members. As soon as the rollers 43 clear the lugs 42, the springs 33 serve immediately to carry the crossbar 32 again to its normal position as shown in Fig. 3.

As is clearly shown in Fig. 4, the crossbar 32 is provided with a groove 45 in its rear edge face in position ltoreceive the forward edge of a copy sheet 25 as such sheet is moved forwardly by the rollers 21 and 29 over the impression roller I1. The sheet 25 is permitted to move into position above the impression roller I1 by reason of the fact that the copy sheets are fed forwardly at the time when the opening I6 of the drum is positioned opposite to the impression roller I1, asrshown in Fig. 1. The arrangement is lsuch that the stop bar 32 is released from the `latch means through the medium of the bumper plates V44 pressing on the bumpers 36 at just the moment when the drum section I2 comes into engagement with the top face of the impression roller I1. It is thus clear that when the copy sheet 25 is released by the stop bar 32, the sheet is immediately gripped by the section I2 of the drum and the impression roller I1 for continued movement forwardly with the drum.

In the construction as shown, means comprising a ycrossbar` 43 carried by pivoted arms 41 is provided for stripping the frontend of a copy sheet in due time from the drum section I2 for and described are preferred, the invention is not to be limited to such arrangement, except so far as the claims may be so limited, it being understood that changes might well be made in the 'construction without departing from the invention.

I claim:

l. In a duplicating machine, the combination of a frame, a drum rotatably mounted on said frame, means for driving said drum, a platen rotatably mounted on said frame in position to engagev said drum so as to rotate at the same surface speed. therewith, means for securing a form removablyV in position on said drum, stop means adapted normally to travel around with the'drum a short distance'in advance of said form and movable lcircumferentially of the drum toward said form against the action of a spring, means adapted upon each revolution of the drum to have releasable engagement with said stop means for holding the stop means stationary slightly in advance of said platen While the drum continuesl to rotate, means for feeding a-'copy sheet into engagement with said stop means so as to align said copy sheet into normal operative position above said platen, and means adapted when the form on the drum reaches approximately normal printing position with respect to the held copy sheet to release said stop means Since these from. said holding. means; for freeing the .jcopy 'sheetsoastolbe forwarded,bythecooperative action ofjtheV .drum and platen in. printinglrelation z to' theform.

v .2. Inaiduplicating machine, the combination formmemovablyin position on said drtun,stop means:adapted.normally to travel varound with Y the;r drum a short.distance.. inadvance of' said ..formand movable: circumferentially of the drum toward. said formiA against the ,action of ai spring, meansv adaptedupon eachJrevolution of thedrum to have releasable engagement 'withvsaid stop meansfor .holding the.;stop means stationary slightly in advance of saidiplaten'while the drum 1 continues to:rotate,k means. for l feeding. a copy,v sheet; into?Y engagement with; said r stop ymeans so -as to align said'copy sheet into normal operative .position above said'platen, and means carriedzaround with jthe drum adapted by pressure forwardly.OnsaidstOp'means when the form reachesf approximately normal printing position .Withfrespect-to the ahold copy sheet to release -the stop Ymeans forfreeing the copy sheet so as to be forwarded byV thexzoope'rativeactionY ofthe drumfand platen in printin'grelation to the form.

1n a duplicating'machine,.1the combination Vof a frame, axdrumA rotatably mounted on said g frame, means -for'drivingsaid drum, a platen rotatably mounted onsaid frame in position to :engagexsaid drumsof asto rotate `at the sameA .surface` speed therewith,` rmeansi for securing a formmemovablyingposition onsaid drum, stop -means adaptednormally to travel around with the drum afshort distance'in advance of Said form andV movable circumferentially of the drum i toward said form against the action of a spring,

latch means adapted upon each revolution of the 1 drum toengagesaidstop means and to -hold the stop means stationary slightly inadvanceof said platen while the, :drum continues to' rotate so as totension said )spring as the drum continues to rotate and adapted upon the application of increased pressure thereon to release the stop means, means for feeding a copy sheet into engagement with said stop means so as to align said copy sheet in normal operative position above said platen, and means adapted when the form on the drum reaches approximately normal printing position with respect to the held copy sheet to apply pressure on said stop means for releasing it so as to free the copy sheet for forward movement by the cooperative action of the drum and platen in printing relation to the form.

4. In a duplicating machine, the combination of a frame, a drum rotatably mounted on said frame, means for driving said drum, a platen rotatably mounted on said frame in position to engage said drum so as to rotate at the same surface speed therewith, means for securing a form removably in position on said drum, stop means adapted normally to travel around with the drum a short distance in advance of said form and movable circumferentially of the drum toward said form against the action of a spring, latch means adapted upon each revolution of the drum to have releasable engagement with said stop means for holding the stop means` stationary slightly in advance of said platen while the drum continues to rotate, means adapted to feed a .fcopysheetforwardly into;.engagementwitrnsaid stop; 'means so: as.' to :bring :said copysheetzginto normalzoperative position above said platen; and v means. adapted ',by pressure. forwardly .ion said stop means whenthe form.l on; the .drum'reaches approximately normal `printing .position with respect tothe copy sheet to. release saidstop means :from said holding means vfor;fre'eing theicopy sheet vfor. forwardA movement. by .the cooperative action of the drum andv platen imprinting relation to. the' form.

.'5.:I;r1 1.a duplicating machine,.:.the.v combination `ofna i frame, a..drum: rotatablymounteduonsaid frame, means for .driving said drum, ,a .platen rotatablymounted on saidaframeirrposition toen- Agage'said drum so as .to rotate. at the same surface speed. therewith,` .means for. securing: .a form.. re-

l movaloly in :position onY said ,drum stop.: means adapted normallyto travel aroundA .with thepdrum 20.. a shortldistance in advanceof said `form and movable. .circumferentially of the :drum toward, `said form against the :action ofiaspringa plate .pivotvallymountedin position close to the .path of moveiment .of Vsaid stop means, a' spring normally holdingE said platenyieldingly .in position fori. engaging said4 stop-means `upon each revolutionv of. the. drum so as to hold the.stopmeansstationary at a point slightly in advance of said platen during the continued forward rotation of the drum and .adapted uponthe. subsequent .application of. heavyipressure tothe stop .means to yield: for. releasing said stop means, .means adapted to feed a copy sheet forwardly into engagement with' said stop'means solas-toialign .said copyv sheet linto normal oper- V ativepositionabovesaid platenandmeans adaptedwhenlthe form Aon the .drum reachesv approximatelyV normalfprinting position with. respectA to the. .cop-y `'sheet toapply :pressure on said stop meansforreleasing it forr freeing the copy sheet 1wfor.' forward movement .by the cooperative action ofthe-drum and platen in printing relation to the form. v

fdlnaiduplicating machine, the combination of a? frame, a :drum rotatablymo'unted on saidV t5` frame,.means: for; rotating saidV drum,` a platenlrotatablya .mounted on said framein positionto engage said drum so as to rotate at the same surface speed therewith, means for securing a form removably in position on said drum, two arms pivotally mounted on an axis extending longitudinally of the drum, a stop member carried by said arms in advance of said form and movable toward and from the form, spring means normally holding said stop member at the limit of its movement away from the form, means adapted upon each revolution of the drum to releasably hold said stop member stationary a short distance in advance of said platen while the drum continues to rotate, means for feeding a copy sheet into engagement with said stop member so as to align said copy sheet into normal operative position above said platen, and means carried around with the drum adapted upon each revolution of the drum when the form on the drum reaches approximately normal printing position with respect to the copy sheet to apply pressure forwardly on said stop means for releasing said stop member from said holding means for freeing the copy sheet for forward movement by the cooperative action of the drum and platen in printing relation to the form.

7. In a duplicating machine, the combination of a frame, a drum rotatably mounted on said frame having its side wall cut away at one side portion, means for rotating said drum, ,a platen rotatablymounted on said frame in position to engage said drum so as to'rotate at the same surface speed therewith; means for securing a. form removably in position on said drum with its leading edge positioned adjacent to the side opening vin said drum, two arms pivotally mounted on an axis extending longitudinally of the drum, a stop member carried by said arms so as to be movable circumferentially of the drum in said side opening, spring means normally holding said stop member at the limit of its movement away from the form, pressure releasable latch means adapted upon each revolution of the drum to releasably hold said stop member stationary a short distance in advance of said platen while the drum continues to rotate, means for feeding a copy sheet into engagement with said stop member so as to align said copy sheet into normal operative position above said platen, and bumper means carried by said drum adapted upon each revolution of the drum when the form on the drum reaches approximately normall printing position with respect to the copy sheet to apply pressure forwardly on said arms for releasing said stop member from said holding means for freeing the copy sheet for forward movement by the cooperative action of the drum and platen in printing relation to the form.

8. In a duplicating machine, the combination of a drum rotatably mounted in position comprising two sections in spaced relation to each other circumferentially at one side at least of the drum, means for rotating said drum, means for securing a form removably in position on one of said drum sections with its leading edge positioned adjacent to the opening between the two sections, a platen rotatably mounted in position to engage said form so as to rotate at the same surface speed therewith;two arms pivotally mounted on an axis extending longitudinally of the drum, a stop member carried by said arms so as to be movable circumferentially of the drum in the open space between the sections adjacent to the leading edge of said form, spring means normally holding said stop member at the limit of its movement away from the form, pressure releasable latch means adapted upon each revolution of the drum releasably to hold said stop member stationary a short distance in advance of said platen while the drum continues to rotate, means for feeding a copy sheet into engagement with said stop member so as to align said copy sheet into normal operative position above said platen, and bumper means carried by said drum adapted upon each revolution of the drum when the form on the drum reaches approximately normal printing position with respect to the copy sheet to engage cooperating bumper means on said arms for applying pressure forwardly on said stop means so as to release said stop member from said holding means for freeing the copy sheet for forward movement by the cooperative action of the drum and platen in printing relation to the form.

9. In a duplicating machine, the combination of a drum rotatably mounted in position and having an opening in its wall at one side portion, a platen rotatably mounted in position to engage said drum so as to rotate at the same surface speed therewith, means for securing a form removably in position on said drum with its leading edge adjacent to the rear edge of said opening, stop means adapted normally to travel around with the drum a short distance in advance of said form and movable circumferentially of the drum in said opening toward said form, yielding means normally holding said stop means moved forward in spaced relation to said form, means adapted upon each revolution of the drum releasably to engage said stop means for holding the stop means stationary immediately in advance of said platen while the drum continues to rotate so as to engage the leading edge of a copy sheet fed into said opening in the drum for stopping the copy sheet and aligning it into normal operative position above said platen, and means adapted when the form on the drum approaches normal printing position to force said stop means out of engagement with said holding means for freeing the copy sheet so as to permit the sheet to be forwarded by the cooperative action of the drum and platen in printing relation to the form.

MORRIS P. NEAL. 

